Solved-Assignment Four -Solution

generate a heightmap texture using fBm (see noise.h, and this tutorial) use the heightmap texture to displace vertices in the vertex shader

2.2 Advanced

implement noise texture generation in the fragment shader 5%

implement other noise functions to generate terrain (e.g. hybrid multifractal and ridged multifractal) 5%

instead of generating a plane world, create a spherical world 10%

create an in nite world (new tiles on demand, requires GPU noise) 15% use L-system to add trees to your terrain 15%

use ImGUI to control parameters live 5%

• Rendering

3.1 Basic (35%)

calculate surface normals, add di use and specular shading

texture according to height and slope (e.g. snow will not deposit on steep slopes, grass won’t grow at altitude)

implement the skybox texture using OpenGLs cubemap textures

3.2 Advanced

use the normal map texture (water.png) to represent waves. Make them translate over time. (5%) add a mirroring e ect to the water; this is achieved by mirroring the camera position with respect to the water plane, render your scene in a framebu er, and placing the texture back in a second step. You can also simulate refraction by blending the mirrored and non-mirrored images according to the

incidence angle of your camera w.r.t. water (15%) use noise to distort the re ected image (5%)

• Animation

4.1 Basic (10%)

implement WASD camera controls

4.2 Advanced

use a bezier curve to animate the camera path (5%)

implement a FPS camera, camera height is determined by terrain height (5%)

use a displacement map to animate waves; the map can be computed numerically as a sum of periodic functions varying over time (10%)

use particles and billboards to animate 3D snow (10%)

• Getting Started

The starter code is lled with TODO comments. The following order of completion is recommended:

genTerrainMesh() in main.cpp drawTerrain() in main.cpp

lerp(), perlin2D(), and fBm2DTexture in noise.h terrain vshader.glsl

drawSkybox() in main.cpp

KeyEvent listener callback in main.cpp terrain fshader.glsl